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Future perfect
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Future perfect continuous
I'll have been illustrating you'll have been illustrating he'll have been illustrating we'll have been illustrating you'll have been illustrating they'll have been illustrating
I'd be illustrating you'd be illustrating he'd be illustrating we'd be illustrating you'd be illustrating they'd be illustrating
Past
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Past continuous
I'd have been illustrating you'd have been illustrating he'd have been illustrating we'd have been illustrating you'd have been illustrating they'd have been illustrating